Systems and methods for minimizing vibration sensitivity for protected microphones

ABSTRACT

Protected microphone systems may include one or more dampeners, one or more cavities, or a combination thereof to minimize the vibration sensitivity of a microphone of the protected microphone systems. The dampeners, when present, may be constructed of a foam material or a thin metal material.

CROSS REFERENCE TO RELATED APPLICATION(S)

This application is a continuation of U.S. patent application Ser. No.15/934,399, filed on Mar. 23, 2018, the contents of which areincorporated by reference herein in their entirety.

TECHNICAL FIELD

This disclosure relates to vibration isolation in microphones.

BACKGROUND

Vibration of a device may cause energy to be detected by a microphone ofan image capture device. This vibration may be detected as noise andcause degradation of the audio experience. Typical vibration isolationstrategies employ dampeners to isolate microphone components. However,these strategies have been ineffective in protected microphoneimplementations.

SUMMARY

Disclosed herein are implementations of a system and method forminimizing vibration sensitivity for protected microphones. In exampleswhere a microphone is protected by a membrane or a mesh, vibration noisemay be dependent on one or more cavities in a device, in addition to thevibration sensitivity of the microphone component alone.

In one aspect, an image capture device may include a housing. Thehousing may include a first cavity that is fluidly connected to a firstport of the image capture device and an external environment relative tothe image capture device. The image capture device may include an audiocapture device configured to obtain an audible sound.

The image capture device may include a second cavity that is fluidlyconnected to a second port and the audio capture device. The imagecapture device may include a protective layer. The protective layer mayseparate the first cavity and the second cavity. The first cavity may bedefined by a portion of the housing, a portion of the protective layer,or both. A portion of the second cavity may be defined by a supportstructure.

In another aspect, an image capture device may include a housing. Thehousing may include a first port and a first cavity. The first cavitymay be fluidly connected to the first port of the image capture deviceand an external environment relative to the image capture device. Theimage capture device may include an audio capture device configured toobtain an audible sound. The image capture device may include a secondcavity that is fluidly connected to a second port and the audio capturedevice.

In this example, the image capture device may include a dampener. Thedampener may be configured to absorb vibration energy. The image capturedevice may include a protective layer. The protective layer may separatethe first cavity from the second cavity. The first cavity may be definedby a portion of the housing, a first surface of the protective layer, orboth. The second cavity may be defined by a portion of the dampener, asecond surface of the protective layer, or both.

In another aspect, an image capture device may include a housing, aprotective layer, an audio capture device, a first cavity, and a secondcavity. The housing may include a first port. The first port may befluidly connected to an external environment relative to the imagecapture device. The first port may be fluidly connected to a second portthat is spaced from and fluidly connected to the first port. Theprotective layer may be disposed between the first port and the secondport. The audio capture device may be configured to obtain an audiblesound via the second port. The first cavity may extend between the firstport and a first surface of the protective layer. The second cavity mayextend between a second surface of the protective layer, the secondport, the audio capture device, or any combination thereof.

BRIEF DESCRIPTION OF THE DRAWINGS

The disclosure is best understood from the following detaileddescription when read in conjunction with the accompanying drawings. Itis emphasized that, according to common practice, the various featuresof the drawings are not to-scale. On the contrary, the dimensions of thevarious features are arbitrarily expanded or reduced for clarity.

FIG. 1 is a diagram of an example of an image capture device.

FIG. 2 is a diagram of an example of a protected microphone system witha membrane protective layer.

FIG. 3 is a diagram of another example of a protected microphone systemwith a membrane protective layer.

FIG. 4 is a diagram of an example of a protected microphone system witha mesh protective layer.

FIG. 5 is a diagram of another example of a protected microphone systemwith a mesh protective layer.

FIG. 6 is a diagram of another example of a protected microphone systemwith a mesh protective layer.

FIG. 7 is a diagram of another example of a protected microphone systemwith a mesh protective layer.

FIG. 8 is a diagram of another example of a protected microphone systemwith a mesh protective layer.

FIG. 9 is a diagram of another example of a protected microphone systemwith a mesh protective layer.

FIG. 10 is a diagram of another example of a protected microphone systemwith a mesh protective layer.

DETAILED DESCRIPTION

In the embodiments disclosed herein, protected microphone systems mayinclude dampeners, a protective layer, or a combination thereof tominimize the vibration sensitivity of a microphone of the protectedmicrophone systems. The dampeners may be constructed of a foam material,a thin metal material, or any suitable material that is pliable andconfigured to absorb vibration energy. The protective layer may be amembrane, a mesh, or any suitable material. The protective layer may beair permeable or non-air permeable.

While the disclosure has been described in connection with certainembodiments, it is to be understood that the disclosure is not to belimited to the disclosed embodiments but, on the contrary, is intendedto cover various modifications and equivalent arrangements includedwithin the scope of the appended claims, which scope is to be accordedthe broadest interpretation so as to encompass all such modificationsand equivalent structures as is permitted under the law.

FIG. 1 is a diagram of an example of an image capture device 100. Insome implementations, an image capture device 100 may be an actioncamera that includes an audio component 112, an input/output (I/O) unit114, a sensor controller 120, a processor 124, an image sensor 130, ametadata unit 132, an optics unit 134, a communication unit 140, a powersystem 150, or a combination thereof.

In some implementations, the audio component 110, which may include amicrophone, may receive, sample, capture, record, or a combinationthereof, audio information, such as sound waves. The audio informationmay be associated with, or stored in association with, image or videocontent contemporaneously captured by the image capture device 100. Insome implementations, audio information may be encoded using, forexample, Advanced Audio Coding (AAC), Audio Compression-3 (AC3), MovingPicture Experts Group Layer-3 Audio (MP3), linear Pulse Code Modulation(PCM), Motion Picture Experts Group-High efficiency coding and mediadelivery in heterogeneous environments (MPEG-H), and/or other audiocoding formats or codecs. In one or more implementations of sphericalvideo and/or audio, the audio codec may include a three-dimensionalaudio codec, such as Ambisonics. For example, an Ambisonics codec canproduce full surround audio including a height dimension. Using aG-format Ambisonics codec, a special decoder may be omitted.

In some implementations, the user interface unit 112 may include one ormore units that may register or receive input from and/or presentoutputs to a user, such as a display, a touch interface, a proximitysensitive interface, a light receiving/emitting unit, a soundreceiving/emitting unit, a wired/wireless unit, and/or other units. Insome implementations, the user interface unit 112 may include a display,one or more tactile elements (such as buttons and/or virtual touchscreen buttons), lights (LEDs), speakers, and/or other user interfaceelements. The user interface unit 112 may receive user input and/orprovide information to a user related to the operation of the imagecapture device 100.

In some implementations, the user interface unit 112 may include adisplay unit that presents information related to camera control or use,such as operation mode information, which may include image resolutioninformation, frame rate information, capture mode information, sensormode information, video mode information, photo mode information, or acombination thereof; connection status information, such as connected,wireless, wired, or a combination thereof; power mode information, suchas standby mode information, sensor mode information, video modeinformation, or a combination thereof; information related to otherinformation sources, such as heart rate information, global positioningsystem information, or a combination thereof; and/or other information.

In some implementations, the user interface unit 112 may include a userinterface component such as one or more buttons, which may be operated,such as by a user, to control camera operations, such as to start, stop,pause, and/or resume sensor and/or content capture. The camera controlassociated with respective user interface operations may be defined. Forexample, the camera control associated with respective user interfaceoperations may be defined based on the duration of a button press, whichmay be pulse width modulation, a number of button presses, which may bepulse code modulation, or a combination thereof. In an example, a sensoracquisition mode may be initiated in response to detecting two shortbutton presses. In another example, the initiation of a video mode andcessation of a photo mode, or the initiation of a photo mode andcessation of a video mode, may be triggered or toggled in response to asingle short button press. In another example, video or photo capturefor a given time duration or a number of frames, such as burst capture,may be triggered in response to a single short button press. Other usercommand or communication implementations may also be implemented, suchas one or more short or long button presses.

In some implementations, the I/O unit 114 may synchronize the imagecapture device 100 with other cameras and/or with other externaldevices, such as a remote control, a second image capture device, asmartphone, a user interface device, and/or a video server. The I/O unit114 may communicate information between I/O components. In someimplementations, the I/O unit 114 may be connected to the communicationunit 140 to provide a wired and/or wireless communications interface,such as a Wi-Fi interface, a Bluetooth interface, a USB interface, anHDMI interface, a Wireless USB interface, an NFC interface, an Ethernetinterface, a radio frequency transceiver interface, and/or otherinterfaces, for communication with one or more external devices, such asa mobile device, or another metadata source. In some implementations,the I/O unit 114 may interface with LED lights, a display, a button, amicrophone, speakers, and/or other I/O components. In someimplementations, the I/O unit 114 may interface with an energy source,such as a battery, and/or a Direct Current (DC) electrical source.

In some implementations, the I/O unit 114 of the image capture device100 may include one or more connections to external computerized devicesfor configuration and/or management of remote devices, as describedherein. The I/O unit 114 may include any of the wireless or wirelineinterfaces described herein, and/or may include customized orproprietary connections for specific applications.

In some implementations, the sensor controller 120 may operate orcontrol the image sensor 130, such as in response to input, such as userinput. In some implementations, the sensor controller 120 may receiveimage and/or video input from the image sensor 130 and may receive audioinformation from the audio component 110.

In some implementations, the processor 122 may include a system on achip (SOC), microcontroller, microprocessor, central processing unit(CPU), digital signal processor (DSP), application-specific integratedcircuit (ASIC), graphics processing unit (GPU), and/or other processorthat may control the operation and functionality of the image capturedevice 100. In some implementations, the processor 122 may interfacewith the sensor controller 120 to obtain and process sensoryinformation, such as for object detection, face tracking, stereo vision,and/or other image processing.

In some implementations, the sensor controller 120, the processor 122,or both may synchronize information received by the image capture device100. For example, timing information may be associated with receivedsensor data, and metadata information may be related to content, such asimages or videos, captured by the image sensor 130 based on the timinginformation. In some implementations, the metadata capture may bedecoupled from video/image capture. For example, metadata may be storedbefore, after, and in-between the capture, processing, or storage of oneor more video clips and/or images.

In some implementations, the sensor controller 120, the processor 122,or both may evaluate or process received metadata and may generate othermetadata information. For example, the sensor controller 120 mayintegrate the received acceleration information to determine a velocityprofile for the image capture device 100 concurrently with recording avideo. In some implementations, video information may include multipleframes of pixels and may be encoded using an encoding method, such asH.264, H.265, CineForm, and/or other codecs.

Although not shown separately in FIG. 1, one or more of the audiocomponent 110, the user interface unit 112, the I/O unit 114, the sensorcontroller 120, the processor 122, the electronic storage unit 124, theimage sensor 130, the metadata unit 132, the optics unit 134, thecommunication unit 140, or the power systems 150 of the image capturedevice 100 may communicate information, power, or both with one or moreother units, such as via an electronic communication pathway, such as asystem bus. For example, the processor 122 may interface with the audiocomponent 110, the user interface unit 112, the I/O unit 114, the sensorcontroller 120, the electronic storage unit 124, the image sensor 130,the metadata unit 132, the optics unit 134, the communication unit 140,or the power systems 150 via one or more driver interfaces and/orsoftware abstraction layers. In some implementations, one or more of theunits shown in FIG. 1 may include a dedicated processing unit, memoryunit, or both (not shown). In some implementations, one or morecomponents may be operable by one or more other control processes. Forexample, a global positioning system receiver may include a processingapparatus that may provide position and/or motion information to theprocessor 122 in accordance with a defined schedule, such as values oflatitude, longitude, and elevation at 10 Hz.

In some implementations, the electronic storage unit 124 may include asystem memory module that may store executable computer instructionsthat, when executed by the processor 122, perform variousfunctionalities including those described herein. For example, theelectronic storage unit 124 may be a non-transitory computer-readablestorage medium, which may include executable instructions, and aprocessor, such as the processor 122, may execute an instruction toperform one or more, or portions of one or more, of the operationsdescribed herein. The electronic storage unit 124 may include storagememory for storing content, such as metadata, images, audio, or acombination thereof, captured by the image capture device 100.

In some implementations, the electronic storage unit 124 may includenon-transitory memory for storing configuration information and/orprocessing code for video information and metadata capture, and/or toproduce a multimedia stream that may include video information andmetadata in accordance with the present disclosure. In someimplementations, the configuration information may include capture type,such as video or still image, image resolution, frame rate, burstsetting, white balance, recording configuration, such as loop mode,audio track configuration, and/or other parameters that may beassociated with audio, video, and/or metadata capture. In someimplementations, the electronic storage unit 124 may include memory thatmay be used by other hardware/firmware/software elements of the imagecapture device 100.

In some implementations, the image sensor 130 may include one or more ofa charge-coupled device sensor, an active pixel sensor, a complementarymetal-oxide-semiconductor sensor, an N-type metal-oxide-semiconductorsensor, and/or another image sensor or combination of image sensors. Insome implementations, the image sensor 130 may be controlled based oncontrol signals from a sensor controller 120.

The image sensor 130 may sense or sample light waves gathered by theoptics unit 134 and may produce image data or signals. The image sensor130 may generate an output signal conveying visual information regardingthe objects or other content corresponding to the light waves receivedby the optics unit 134. The visual information may include one or moreof an image, a video, and/or other visual information.

In some implementations, the image sensor 130 may include a videosensor, an acoustic sensor, a capacitive sensor, a radio sensor, avibrational sensor, an ultrasonic sensor, an infrared sensor, a radarsensor, a Light Detection and Ranging (LIDAR) sensor, a sonar sensor, orany other sensory unit or combination of sensory units capable ofdetecting or determining information in a computing environment.

In some implementations, the metadata unit 132 may include sensors suchas an inertial measurement unit, which may include one or moreaccelerometers, one or more gyroscopes, a magnetometer, a compass, aglobal positioning system sensor, an altimeter, an ambient light sensor,a temperature sensor, and/or other sensors or combinations of sensors.In some implementations, the image capture device 100 may contain one ormore other sources of metadata information, telemetry, or both, such asimage sensor parameters, battery monitor, storage parameters, and/orother information related to camera operation and/or capture of content.The metadata unit 132 may obtain information related to the environmentof the image capture device 100 and aspects in which the content iscaptured.

For example, the metadata unit 132 may include an accelerometer that mayprovide device motion information, including velocity and/oracceleration vectors representative of motion of the image capturedevice 100. In another example, the metadata unit 132 may include agyroscope that may provide orientation information describing theorientation of the image capture device 100. In another example, themetadata unit 132 may include a global positioning system sensor thatmay provide global positioning system coordinates, time, and informationidentifying a location of the image capture device 100. In anotherexample, the metadata unit 132 may include an altimeter that may obtaininformation indicating an altitude of the image capture device 100.

In some implementations, the metadata unit 132, or one or more portionsthereof, may be rigidly coupled to the image capture device 100, suchthat motion, changes in orientation, or changes in the location of theimage capture device 100 may be accurately detected by the metadata unit132. Although shown as a single unit, the metadata unit 132, or one ormore portions thereof, may be implemented as multiple distinct units.For example, the metadata unit 132 may include a temperature sensor as afirst physical unit and a global positioning system unit as a secondphysical unit. In some implementations, the metadata unit 132, or one ormore portions thereof, may be included in an image capture device 100 asshown or may be included in a physically separate unit operativelycoupled to, such as in communication with, the image capture device 100.

In some implementations, the optics unit 134 may include one or more ofa lens, macro lens, zoom lens, special-purpose lens, telephoto lens,prime lens, achromatic lens, apochromatic lens, process lens, wide-anglelens, ultra-wide-angle lens, fisheye lens, infrared lens, ultravioletlens, perspective control lens, other lens, and/or other opticscomponents. In some implementations, the optics unit 134 may include afocus controller unit that may control the operation and configurationof the camera lens. The optics unit 134 may receive light from an objectand may focus received light onto an image sensor 130. Although notshown separately in FIG. 1, in some implementations, the optics unit 134and the image sensor 130 may be combined, such as in a combined physicalunit, for example, a housing.

In some implementations, the communication unit 140 may be coupled tothe I/O unit 114 and may include a component, such as a dongle, havingan infrared sensor, a radio frequency transceiver and antenna, anultrasonic transducer, and/or other communications interfaces used tosend and receive wireless communication signals. In someimplementations, the communication unit 240 may include a local, such asBluetooth or Wi-Fi, and/or broad range, such as cellular Long TermEvolution (LTE), communications interface for communication between theimage capture device 100 and a remote device, such as a mobile device.The communication unit 140 may communicate using, for example, Ethernet,802.11, worldwide interoperability for microwave access (WiMAX), ThirdGeneration Partnership Project (3GPP), LTE, digital subscriber line(DSL), asynchronous transfer mode (ATM), InfiniBand, PCI ExpressAdvanced Switching, and/or other communication technologies. In someimplementations, the communication unit 140 may communicate usingnetworking protocols, such as multiprotocol label switching (MPLS),transmission control protocol/Internet protocol (TCP/IP), User DatagramProtocol (UDP), hypertext transport protocol (HTTP), simple mailtransfer protocol (SMTP), file transfer protocol (FTP), and/or othernetworking protocols.

Information exchanged via the communication unit 140 may be representedusing formats including one or more of hypertext markup language (HTML),extensible markup language (XML), and/or other formats. One or moreexchanges of information between the image capture device 100 and remoteor external devices may be encrypted using encryption technologiesincluding one or more of secure sockets layer (SSL), transport layersecurity (TLS), virtual private networks (VPNs), Internet Protocolsecurity (IPsec), and/or other encryption technologies.

In some implementations, the one or more power systems 150 supply powerto the image capture device 100. For example, for a small-sized,lower-power action camera, a wireless power solution, such as battery,solar cell, inductive, such as contactless, power source, rectification,and/or other power supply, may be used.

Consistent with the present disclosure, the components of the imagecapture device 200 may be remote from one another and/or aggregated. Forexample, one or more sensor components may be distal from the imagecapture device 100. Multiple mechanical, sensory, or electrical unitsmay be controlled by a learning apparatus via network/radioconnectivity.

FIG. 2 is a diagram of an example of a protected microphone system 200with a membrane protective layer 210. In this example, the membraneprotective layer 210 may be silicone, polytetrafluoroethylene (PTFE), orany suitable material, and it may be air permeable or non-air permeable.The protected microphone system 200 includes a microphone 220, a printedcircuit board (PCB) 230, and a housing 240. The PCB 230 may be flexibleor rigid, and is electrically coupled to the microphone 220. The PCB 230includes a port P1 to allow sound to travel to the microphone 220.

The housing 240 includes a port P2 to allow sound to travel into theprotected microphone system 200. In this example, the membraneprotective layer 210 is adhered to the housing 240 using supportstructures 250. The membrane protective layer 210 includes an activearea 260. The active area 260, along with a portion of the housing 240and a portion of the support structures 250 form a cavity 270 within theprotected microphone system 200. In this example, dampeners 280 areincluded between the PCB 230 and the membrane protective layer 210, andthe membrane protective layer 210 is adhered to the dampeners 280 usingsupport structures 250. The dampeners 280 may be a foam, thin metal, orany suitable material. The active area 260, along with a portion of thedampeners 280, a portion of the PCB 230, and a portion of the supportstructures 250 form a cavity 290 within the protective microphone system200. As shown in FIG. 2, the cavity 270 and the cavity 290 are separatedby the active area 260 of the membrane protective layer 210. In thisexample, a first velocity (V1) represents the motion of the housing 240and support structure 250, a second velocity (V2) represents the motionof the PCB 230 and the microphone 220, and a third velocity (V3)represents the motion of the active area 260. V1 is a forcing velocityon the housing 240. For example, V1 may be the velocity of handlebars towhich the image capture device is mounted. V1 may not be dependent onthe parameters of the dampeners 280, membrane protective layer 210,support structures 250, or a combination of any of the above. Thevelocity difference between V1 and V2 may be based on the elasticity ofthe dampeners 280.

V2 and V3 may vary based on the stiffness of the dampeners 280, the massof the microphone 220 and PCB 230 structure, the stiffness of themembrane protective layer 210, the mass of the membrane protective layer210, or a combination of any of the above. The dampeners 280 may have astiffness above approximately 1×10⁶ N/m. In some examples, a stiffnessbelow 1×10⁶ N/m may result in a significant impact on microphoneperformance. The membrane protective layer 210 may have a stiffnessranging from 10 to 50 N/m. The membrane protective layer 210 may have amass that is below approximately 2×10⁻⁵ kg. An example where themembrane protective layer 210 has a mass that is above 2×10⁻⁵ kg mayresult in poor microphone performance as the resonance moves too farinto the audible frequency range. These parameters, for example dampenerstiffness, microphone and PCB mass, membrane stiffness, and membranemass, may each vary with the dimensions of cavity 270, cavity 290, P1,and P2.

FIG. 3 is a diagram of another example of a protected microphone system300 with a membrane protective layer 310. In this example, the membraneprotective layer 310 may be silicone, PTFE, or any suitable material,and it may be air permeable or non-air permeable. The protectedmicrophone system 300 includes a microphone 320, a PCB 330, and ahousing 340. The PCB 330 may be flexible or rigid, and is electricallycoupled to the microphone 320. The PCB 330 includes a port P1 to allowsound to travel to the microphone 320.

The housing 340 includes a port P2 to allow sound to travel into theprotected microphone system 300. In this example, the membraneprotective layer 310 is adhered to the PCB 330 using support structures350. The membrane protective layer 310 includes an active area 360. Inthis example, dampeners 380 are included between the PCB 330 and themembrane protective layer 310, and the membrane protective layer 310 isadhered to the dampeners 380 using support structures 350. The dampeners380 may be a foam, thin metal, or any suitable material. The active area360, along with a portion of the housing 340, a portion of the supportstructures 350, and a portion of the dampeners 380 form a cavity 370within the protected microphone system 300. The active area 360, alongwith a portion of the PCB 230, and a portion of the support structures350 form a cavity 390 within the protective microphone system 300. Asshown in FIG. 3, the cavity 370 and the cavity 390 are separated by theactive area 360 of the membrane protective layer 310. In this example, afirst velocity (V1) represents the motion of the housing 340, a secondvelocity (V2) represents the motion of the PCB 330 and the membranesupport structure 350, and a third velocity (V3) represents the motionof the active area 360.

V2 and V3 may vary based on the stiffness of the dampeners 380, the massof the microphone 220 and PCB 230 structure, the stiffness of themembrane protective layer 310, the mass of the membrane protective layer310, or a combination of any of the above. In this example, thestiffness of the dampeners 380 may have a reduced effect on themicrophone performance when compared to the example in FIG. 2. Thedampeners 380 may have a stiffness above approximately 1×10⁷ N/m. Insome examples, a stiffness below 1×10⁷ N/m may result in a significantimpact on microphone performance. In this example, changing thestiffness of the membrane protective layer 310 may not change therelationship between the acoustic and vibration sensitivities whencompared to the example in FIG. 2. The membrane protective layer 310 mayhave a stiffness ranging from 10 to 100 N/m in this example to produceacceptable acoustic sensitivity. The membrane protective layer 310 mayhave a mass that is below approximately 2×10⁻⁵ kg. An example where themembrane protective layer 310 has a mass that is above 2×10⁻⁵ kg mayresult in poor microphone performance as the resonance moves too farinto the audible frequency range. An example where the membraneprotective layer 310 has a mass that is below 2×10⁻⁶ kg may result inlow vibration sensitivity on a condition that the dampener 380 meet theminimum threshold of stiffness of 1×10⁷ N/m. These parameters, forexample dampener stiffness, microphone and PCB mass, membrane stiffness,and membrane mass, may each vary with the dimensions of cavity 370,cavity 390, P1, and P2.

FIG. 4 is a diagram of an example of a protected microphone system 400with a mesh protective layer 410. In this example, the mesh protectivelayer 410 may be polyester monofilament or any suitable material. Theprotected microphone system 400 includes a microphone 420, a PCB 430,and a housing 440. The PCB 430 may be flexible or rigid, and iselectrically coupled to the microphone 420. In this example, the PCB 430is coupled to the housing 440. The PCB 430 includes a port P1 to allowsound to travel to the microphone 420.

The housing 440 includes a port P2 to allow sound to travel into theprotected microphone system 400. In this example, the mesh protectivelayer 410 is adhered to the housing 440 using support structures 450.The mesh protective layer 410 includes an active area 460. The activearea 460, along with a portion of the housing 440 and a portion of thesupport structures 450 form a cavity 470 within the protected microphonesystem 400. In this example, dampeners 480 are included between the PCB430 and the mesh protective layer 410, and the mesh protective layer 410is adhered to the dampeners 480 using support structures 450. Thedampeners 480 may be a foam, thin metal, or any suitable material. Theactive area 460, along with a portion of the dampeners 480, a portion ofthe PCB 430, and a portion of the support structures 450 form a cavity490 within the protective microphone system 400. As shown in FIG. 4, thecavity 470 and the cavity 490 are separated by the active area 460 ofthe mesh protective layer 410. In this example, a first velocity (V1)represents the motion of the housing 440 and PCB 430, a second velocity(V2) represents the motion of the support structure 450, and a thirdvelocity (V3) represents the motion of the active area 460.

V2 and V3 may vary based on the stiffness of the dampeners 480, the massof the microphone 220 and PCB 230 structure, the stiffness of the meshprotective layer 410, the mass of the mesh protective layer 410, theacoustic resistance of the mesh protective layer 410 or a combination ofany of the above. The dampeners 480 may have a stiffness aboveapproximately 1×10⁶ N/m. In some examples, a stiffness below 1×10⁶ N/mmay result in a significant impact on microphone performance. Theseparameters, for example dampener stiffness, microphone and PCB mass,mesh stiffness, mesh mass, and mesh acoustic resistance, may each varywith the dimensions of cavity 470, cavity 490, P1, and P2.

FIG. 5 is a diagram of another example of a protected microphone system500 with a mesh protective layer 510. In this example, the meshprotective layer 510 may be polyester monofilament or any suitablematerial. The protected microphone system 500 includes a microphone 520,a PCB 530, and a housing 540. The PCB 530 may be flexible or rigid, andis electrically coupled to the microphone 520. In this example,dampeners 580 are coupled to the PCB 530 the housing 540. The PCB 530includes a port P1 to allow sound to travel to the microphone 520.

The housing 540 includes a port P2 to allow sound to travel into theprotected microphone system 500. In this example, the mesh protectivelayer 510 is adhered to the PCB 530 using support structures 550. Themesh protective layer 510 includes an active area 560. The active area560, along with a portion of the housing 540, a portion of the dampeners580, and a portion of the support structures 550 form a cavity 570within the protected microphone system 500. In this example, the meshprotective layer 510 is adhered to the PCB 530 using support structures550. The dampeners 580 may be a foam, thin metal, or any suitablematerial. The active area 560, along with a portion of the PCB 530 and aportion of the support structures 550 form a cavity 590 within theprotective microphone system 500. In this example, the volume of cavity590 is kept to a minimum by adhering the mesh protective layer 510directly to the PCB 530 using support structures 550. As shown in FIG.5, the cavity 570 and the cavity 590 are separated by the active area560 of the mesh protective layer 510. In this example, a first velocity(V1) represents the motion of the housing 540, a second velocity (V2)represents the motion of the PCB 530 and support structure 550, and athird velocity (V3) represents the motion of the active area 560.

V2 and V3 may vary based on the stiffness of the dampeners 580, the massof the microphone 220 and PCB 230 structure, the stiffness of the meshprotective layer 510, the mass of the mesh protective layer 510, theacoustic resistance of the mesh protective layer 510, or a combinationof any of the above. The dampeners 580 may have a stiffness aboveapproximately 1×10⁶ N/m. In some examples, a stiffness below 1×10⁶ N/mmay result in a significant impact on microphone performance. In thisexample, an acoustic resistance of the mesh protective layer 510 ofbelow 700 Rayls (kg/sm²) produce a minimal impact on the acousticsensitivity and low vibration sensitivity. The mesh protective layer 510may have a stiffness of over approximately 1×10⁶ N/m and may have a lowvibration sensitivity. These parameters, for example dampener stiffness,microphone and PCB mass, mesh stiffness, mesh mass, and acousticresistance, may each vary with the dimensions of cavity 570, cavity 590,P1, and P2.

FIG. 6 is a diagram of another example of a protected microphone system600 with a mesh protective layer 610. In this example, the meshprotective layer 610 may be polyester monofilament or any suitablematerial. The protected microphone system 600 includes a microphone 620,a PCB 630, and a housing 640. The PCB 630 may be flexible or rigid, andis electrically coupled to the microphone 620. In this example, the PCB630 is coupled to the housing 640. The PCB 630 includes a port P1 toallow sound to travel to the microphone 620.

The housing 640 includes a port P2 to allow sound to travel into theprotected microphone system 600. In this example, the mesh protectivelayer 610 is adhered to the PCB 630 using support structures 650. Themesh protective layer 610 includes an active area 660. The active area660, along with a portion of the housing 640 and a portion of thesupport structures 650 form a cavity 670 within the protected microphonesystem 600. In this example, the mesh protective layer 610 is adhered tothe PCB 630 using support structures 650. The active area 660, alongwith a portion of the PCB 630 and a portion of the support structures650 form a cavity 690 within the protective microphone system 600. Inthis example, the volume of cavity 690 is kept to a minimum by adheringthe mesh protective layer 610 directly to the PCB 630 using supportstructures 650. As shown in FIG. 6, the cavity 670 and the cavity 690are separated by the active area 660 of the mesh protective layer 610.In this example, a first velocity (V1) represents the motion of thehousing 640, PCB 630, and support structure 650 and a second velocity(V2) represents the motion of the active area 660.

V2 may vary based on the stiffness of the mesh protective layer 610, themass of the mesh protective layer 610, the acoustic resistance of themesh protective layer 610, or a combination of any of the above. In thisexample, an acoustic resistance of the mesh protective layer 610 ofbelow 700 Rayls (kg/sm²) produced a minimal impact on the acousticsensitivity and low vibration sensitivity. Unexpectedly, the systemwithout dampening material yields the lowest vibration sensitivityrelative to acoustic sensitivity. The mesh protective layer 610 may havea stiffness of over approximately 1×10⁶ N/m and may have a low vibrationsensitivity. These parameters, for example mesh stiffness and acousticresistance, may each vary with the dimensions of cavity 670, cavity 690,P1, and P2.

FIG. 7 is a diagram of another example of a protected microphone system700 with a mesh protective layer 710. In this example, the meshprotective layer 710 may be polyester monofilament or any suitablematerial. The protected microphone system 700 includes a microphone 720,a PCB 730, and a housing 740. The PCB 730 may be flexible or rigid, andis electrically coupled to the microphone 720. In this example, the PCB730 is coupled to the housing 740. The PCB 730 includes a port P1 toallow sound to travel to the microphone 720.

The housing 740 includes a port P2 to allow sound to travel into theprotected microphone system 700. In this example, the mesh protectivelayer 710 is adhered to the PCB 730 using support structures 750. Themesh protective layer 710 includes an active area 760. In this example,since the support structures 750 are included on a single side of themesh protective layer 710, the mesh protective layer 710 along with aportion of the housing 740 form a cavity 770 within the protectedmicrophone system 700. In this example, the mesh protective layer 710 isadhered to the housing 740 using support structures 750. The active area760, along with a portion of the PCB 730 and a portion of the supportstructures 750 form a cavity 790 within the protective microphone system700. In this example, the volume of cavity 790 is kept to a minimum byadhering the mesh protective layer 710 directly to the PCB 730 usingsupport structures 750. As shown in FIG. 7, the cavity 770 and thecavity 790 are separated by the active area 760 of the mesh protectivelayer 710. In this example, a first velocity (V1) represents the motionof the housing 740, the PCB 730, and the support structure 750, and asecond velocity (V2) represents the motion of the active area 760.

V2 may vary based on the stiffness of the mesh protective layer 710, themass of the mesh protective layer 710, the acoustic resistance of themesh protective layer 710, or a combination of any of the above. In thisexample, an acoustic resistance of the mesh protective layer 710 ofbelow 700 Rayls (kg/sm²) produced a minimal impact on the acousticsensitivity and low vibration sensitivity. Unexpectedly, the systemwithout dampening material yields the lowest vibration sensitivityrelative to acoustic sensitivity. The mesh protective layer 710 may havea stiffness of over approximately 1×10⁶ N/m and may have a low vibrationsensitivity. These parameters, for example mesh stiffness, mass, andacoustic resistance, may each vary with the dimensions of cavity 770,cavity 790, P1, and P2.

FIG. 8 is a diagram of another example of a protected microphone system800 with a mesh protective layer 810. In this example, the meshprotective layer 810 may be polyester monofilament or any suitablematerial. The protected microphone system 800 includes a microphone 820,a PCB 830, and a housing 840. The PCB 830 may be flexible or rigid, andis electrically coupled to the microphone 820. In this example, the PCB830 is coupled to the housing 840. The PCB 830 includes a port P1 toallow sound to travel to the microphone 820.

The housing 840 includes a port P2 to allow sound to travel into theprotected microphone system 800. In this example, the mesh protectivelayer 810 is adhered to the housing 840 using support structures 850.The mesh protective layer 810 includes an active area 860. The activearea 860, along with a portion of the housing 840 and a portion of thesupport structures 850 form a cavity 870 within the protected microphonesystem 800. The active area 860, along with a portion of the PCB 830 anda portion of the support structures 850 form a cavity 890 within theprotective microphone system 800. In this example, the volume of cavity870 and cavity 890 are substantially similar. As shown in FIG. 8, thecavity 870 and the cavity 890 are separated by the active area 860 ofthe mesh protective layer 810. In this example, a first velocity (V1)represents the motion of the housing 840, the PCB 830, and the supportstructure 850, and a second velocity (V2) represents the motion of theactive area 860.

V2 may vary based on the stiffness of the mesh protective layer 810, themass of the mesh protective layer 810, the acoustic resistance of themesh protective layer 810, or a combination of any of the above. In thisexample, an acoustic resistance of the mesh protective layer 810 ofbelow 700 Rayls (kg/sm²) produced a minimal impact on the acousticsensitivity and low vibration sensitivity. Unexpectedly, the systemwithout dampening material yields the lowest vibration sensitivityrelative to acoustic sensitivity. The mesh protective layer 810 may havea stiffness of over approximately 1×10⁶ N/m and may have a low vibrationsensitivity. These parameters, for example mesh stiffness, mass, andacoustic resistance, may each vary with the dimensions of cavity 870,cavity 890, P1, and P2.

FIG. 9 is a diagram of another example of a protected microphone system900 with a mesh protective layer 910. In this example, the meshprotective layer 910 may be polyester monofilament or any suitablematerial. The protected microphone system 900 includes a microphone 920,a PCB 930, and a housing 940. The PCB 930 may be flexible or rigid, andis electrically coupled to the microphone 920. In this example, the PCB930 is coupled to the housing 940. The PCB 930 includes a port P1 toallow sound to travel to the microphone 920.

The housing 940 includes a port P2 to allow sound to travel into theprotected microphone system 900. In this example, the mesh protectivelayer 910 is adhered to the housing 940 using support structures 950.The mesh protective layer 910 includes an active area 960. The activearea 960, along with a portion of the housing 940 and a portion of thesupport structures 950 form a cavity 970 within the protected microphonesystem 900. The active area 960, along with a portion of the PCB 930 anda portion of the support structures 950 form a cavity 990 within theprotective microphone system 900. In this example, the volume of cavity970 is kept to a minimum by adhering the mesh protective layer 910directly to a portion of the housing 940 closest to port P2 usingsupport structures 950. As shown in FIG. 9, the cavity 970 and thecavity 990 are separated by the active area 960 of the mesh protectivelayer 910. In this example, a first velocity (V1) represents the motionof the housing 940, the PCB 930, and the support structure 950, and asecond velocity (V2) represents the motion of the active area 960.

V2 may vary based on the stiffness of the mesh protective layer 910, themass of the mesh protective layer 910, the acoustic resistance of themesh protective layer 610, or a combination of any of the above. In thisexample, an acoustic resistance of the mesh protective layer 910 ofbelow 700 Rayls (kg/sm²) produced a minimal impact on the acousticsensitivity and low vibration sensitivity. Unexpectedly, the systemwithout dampening material yields the lowest vibration sensitivityrelative to acoustic sensitivity. The mesh protective layer 910 may havea stiffness of over approximately 1×10⁶ N/m and may have a low vibrationsensitivity. These parameters, for example mesh stiffness, mass, andacoustic resistance, may each vary with the dimensions of cavity 970,cavity 990, P1, and P2.

FIG. 10 is a diagram of another example of a protected microphone system1000 with a mesh protective layer 1010. In this example, the meshprotective layer 1010 may be polyester monofilament or any suitablematerial. The protected microphone system 1000 includes a microphone1020, a PCB 1030, and a housing 1040. The PCB 1030 may be flexible orrigid, and is electrically coupled to the microphone 1020. In thisexample, the PCB 1030 is coupled to the housing 1040. The PCB 1030includes a port P1 to allow sound to travel to the microphone 1020.

The housing 1040 includes a port P2 to allow sound to travel into theprotected microphone system 1000. In this example, the mesh protectivelayer 1010 is adhered to the housing 1040 and the PCB 1030 using supportstructures 1050. The mesh protective layer 1010 includes an active area1060. The active area 1060, along with a portion of the housing 1040 anda portion of the support structures 1050 form a cavity 1070 within theprotected microphone system 1000. The active area 1060, along with aportion of the PCB 1030 and a portion of the support structures 1050form a cavity 1090 within the protective microphone system 1000. Asshown in FIG. 10, the cavity 1070 and the cavity 1090 are separated bythe active area 1060 of the mesh protective layer 1010. In this example,a first velocity (V1) represents the motion of the housing 1040, the PCB1030, and the support structure 1050, and a second velocity (V2)represents the motion of the active area 1060.

V2 may vary based on the stiffness of the mesh protective layer 1010,the mass of the mesh protective layer 1010, the acoustic resistance ofthe mesh protective layer 1010, or a combination of any of the above. Inthis example, an acoustic resistance of the mesh protective layer 1010of below 700 Rayls (kg/sm²) produced a minimal impact on the acousticsensitivity and low vibration sensitivity. Unexpectedly, the systemwithout dampening material yields the lowest vibration sensitivityrelative to acoustic sensitivity. The mesh protective layer 1010 mayhave a stiffness of over approximately 1×10⁶ N/m and may have a lowvibration sensitivity. These parameters, for example mesh stiffness,mass, and acoustic resistance, may each vary with the dimensions ofcavity 1070, cavity 1090, P1, and P2.

In the examples described herein, the microphone may be stiffly coupledto the membrane support material or the mesh support material. If adampener is present, the dampener will vibrate separately from the othercomponents of the image capture device, causing pressure fluctuations ina volume directly in front of the microphone. These pressurefluctuations may be detected by the microphone as an acoustic signal.

A volume between the microphone and the membrane material or the meshmaterial may be kept to a minimum to promote direct coupling between themotion of the membrane material or the mesh material and a membrane ofthe microphone. If a non-air permeable membrane is used, the stiffnessof the material may be kept as low as possible. In addition, the mass ofthe membrane material or the mesh material may be kept as low aspossible. For example, as the mass of the membrane material or the meshmaterial decreases, the relative level of acoustic energy to vibrationenergy may increase. In an example where the membrane support materialis not rigidly coupled to the microphone, increasing the membranematerial may cause a drop in acoustic sensitivity. In addition, themotion between the housing, the membrane material or the mesh material,and the microphone may decrease as the mass of the membrane material andthe mesh material decreases.

A port through the image capture device housing to an externalenvironment may be short in a thickness direction with a large diameter.In an example where the mounting between the housing and the meshmaterial or the membrane material is not stiff, a port that is short ina thickness direction with a large diameter may allow pressurefluctuations from any relative motion between the image capture devicehousing and the membrane material or the mesh material to be relieved bythe port. In this example, the vibrations sensitivity at low to midfrequencies may be reduced.

If an open, air permeable mesh is present, the acoustic resistance maybe kept as low as possible. For example, as the acoustic resistanceincreases, acoustic sensitivity is reduced to an asymptote defined bywhere the vibration of the mesh material becomes dominant over the paththrough the acoustic resistor. In addition, as the acoustic resistanceincreases, vibration sensitivity is increased to an asymptote defined bywhere vibration of the mesh is dominant, for example when it is easierto move the mesh than interchange air between the image capture devicehousing and mesh and the volume between the mesh and the microphone.

If an open, air permeable mesh is present, increasing the mesh stiffnessmay decrease vibration sensitivity. Acoustic sensitivity may not beaffected by varying the mesh or dampener stiffness.

Where certain elements of these implementations may be partially orfully implemented using known components, only those portions of suchknown components that are necessary for an understanding of thisdisclosure have been described. Detailed descriptions of other portionsof such known components have been omitted so as not to obscure thedisclosure.

An implementation showing a singular component in this disclosure shouldnot be considered limiting; rather, this disclosure is intended toencompass other implementations including a plurality of the samecomponent, and vice-versa, unless explicitly stated otherwise herein.Further, this disclosure encompasses present and future knownequivalents to the components referred to herein by way of illustration.

As used herein, the terms “image capture device,” “imaging device,” and“camera” may be used to refer to any imaging device or sensor configuredto capture, record, and/or convey still and/or video imagery which maybe sensitive to visible parts of the electromagnetic spectrum, invisibleparts of the electromagnetic spectrum (e.g., infrared, ultraviolet),and/or other energy (e.g., pressure waves).

While certain aspects of the implementations described herein are interms of a specific sequence of steps of a method, these descriptionsare only illustrative of the broader methods of the disclosure and maybe modified as required by the particular applications thereof. Certainsteps may be rendered unnecessary or optional under certaincircumstances. Additionally, certain steps or functionality may be addedto the disclosed implementations, or the order of performance of two ormore steps permuted. All such variations are considered to beencompassed within the disclosure.

While the above detailed description has shown, described, and pointedout novel features of the disclosure as applied to variousimplementations, it will be understood that various omissions,substitutions, and changes in the form and details of the devices orprocesses illustrated may be made by those skilled in the art withoutdeparting from the disclosure. The foregoing description is in no waymeant to be limiting, but rather should be taken as illustrative of thegeneral principles of the technologies.

What is claimed is:
 1. An image capture device comprising: a housingthat includes a first port; a first cavity that is fluidly connected tothe first port and an external environment relative to the image capturedevice; an audio capture device configured to obtain an audible sound; asecond cavity that is fluidly connected to a second port and the audiocapture device; a printed circuit board (PCB) coupled to the audiocapture device; a protective layer that separates the first cavity andthe second cavity, wherein the first cavity is defined by a portion ofthe housing and a portion of the protective layer; and a supportstructure disposed between the PCB and the protective layer, wherein afirst surface of the support structure is adhered to the PCB and asecond surface of the support structure is adhered to the housing. 2.The image capture device of claim 1, wherein the protective layer is amembrane.
 3. The image capture device of claim 2, wherein the membraneis air permeable or non-air permeable.
 4. The image capture device ofclaim 2, wherein the membrane comprises silicone orpolytetrafluoroethylene (PTFE).
 5. The image capture device of claim 1,wherein a portion of the second cavity is defined by a supportstructure.
 6. The image capture device of claim 5, wherein the supportstructure is flexible.
 7. The image capture device of claim 5, whereinthe support structure comprises at least one of a foam material, anadhesive, a thin metal, or a rubber material.
 8. The image capturedevice of claim 5, wherein the support structure is a dampener.
 9. Theimage capture device of claim 1, wherein a volume of the first cavity isgreater than a volume of the second cavity.
 10. An image capture devicecomprising: a housing that includes a first port; a first cavity that isfluidly connected to the first port and an external environment relativeto the image capture device; an audio capture device configured toobtain an audible sound; a second cavity that is fluidly connected to asecond port and the audio capture device; a dampener configured toabsorb vibration energy; a printed circuit board (PCB) coupled to theaudio capture device; a protective layer that separates the first cavityand the second cavity, wherein the first cavity is defined by a portionof the housing and a first surface of the protective layer and thesecond cavity is defined by a second surface of the protective layer;and a support structure disposed between the PCB and the protectivelayer, wherein a first surface of the support structure is adhered tothe PCB and a second surface of the support structure is adhered to thedampener.
 11. The image capture device of claim 10, wherein theprotective layer is a membrane.
 12. The image capture device of claim11, wherein the membrane comprises silicone or polytetrafluoroethylene(PTFE).
 13. The image capture device of claim 10, wherein a portion ofthe second cavity is defined by a support structure.
 14. The imagecapture device of claim 13, wherein the support structure includes adampener that comprises at least one of a foam material, a thin metal,or a rubber material.
 15. The image capture device of claim 13, whereinthe dampener is flexible.
 16. The image capture device of claim 10,wherein a volume of the first cavity is greater than a volume of thesecond cavity.
 17. An image capture device comprising: a housing thatincludes a first port fluidly connected to an external environmentrelative to the image capture device and a second port spaced from andfluidly connected to the first port; a protective layer disposed betweenthe first port and the second port; a printed circuit board (PCB)comprising an audio capture device configured to obtain an audible soundvia the second port; a first cavity extending between the first port anda first surface of the protective layer; a second cavity extendingbetween a second surface of the protective layer, the second port, andthe audio capture device; and a support structure disposed between thePCB and the protective layer, wherein a first surface of the supportstructure is adhered to the PCB and a second surface of the supportstructure is adhered to the housing.
 18. The image capture device ofclaim 17 further comprising: a second support structure between thefirst port and the first surface of the protective layer, wherein thefirst cavity is defined by a portion of the housing, the first surfaceof the protective layer, and a portion of the second support structure.19. The image capture device of claim 17, wherein the second cavity isdefined by a portion of the second surface of the protective layer and aportion of the support structure.
 20. The image capture device of claim17, wherein a volume of the first cavity is greater than a volume of thesecond cavity.